"Holy Water" is subjective. To some, alcohol is the true holy water, because it does actually fight demons, personal ones that is.
(Maybe it's poor taste to make jokes about both alcoholism and holy water, but eh what are you gonna do? )
Essential items you will need to repel the oncoming zombie/vampire.robot/alien/monster invasion. Includes: Bible, Garlic, Stake, Sunlight, Flaming Torch, Crucifix, Chainsaw,Silver Bullets, Pitchfork, Mirror, Shotgun & Holy Water